汚い手を使う (きたないてをつかう) Japanese meaning | KotomoraMeanings
1
expression, godan verb (-u)
play a dirty trick; use underhanded methods; hit below the belt
Idiomatic expression for acting dishonestly or unfairly, especially in competition or conflict. Often implies a deliberate, sneaky tactic.
せ
ない
。
I can't forgive you for using such underhanded methods.